1-1&period; According to the caluculation&comma; prepare enough airbags&comma; towing winches&comma; air comprssor and other instruments neede&period; Before operation&comma; airbags should be inflated with 1&period;25 its safety and airtightness&period; If there is any problm&comma; airbags should be fixed before use&period;

1-2&period; Clear all the obstacles and sharp iron nail from launch ramp&period; Check vessel bottom to ensure no welding scar which may puncture airbags&period;

1-3&period; Fasten towing winch with ship&period;

1-4&period; Close all vessel's valves&comma; fix the helm and screw propeller&period;

2&period; Lifting

2-1&period; Insert airbags between support blocks and inflate them to lift vessel&period; When vessel is lifted&comma; people can take out support blocks under the ship&period;

A&period; For the light weight ship&comma; small amount of airbags can fully lift the ship at one time then it is easy to remove the blocks and insert left airbags for launch&period;

B&period; For the heavy ship&comma; it will be lifted by airbags step by step&period; First people need to find the best point for airbag lifting&period; The best position means where airbags can get big contact area with vessel bottom and also far away from vessel's gravity center&period; People may refer to the right drawing to find lifting condition need to be satified&period; When the first batch airbags lift part of vessel away from support blocks peole can take out some blocks in front of airbags&period; Then insert more airbags to lift vessel&comma; step by step the vessel can be lifted fully by airbags&period; At the time people can remove all support blocks under vessel&period;

C&period; The calculation of airbag lifting is very important&period; When people use airbag to lift bow first the blocks under stern will bear increasing press&period; According to calculation if there is possible damage to launch ramp people may increase blocks quantity under stern&period;

3&period; Launch

Under some conditions the vessel need to be shifted to near water before launching&period; But it is not necessary for all launch projects&period;

3-1&period; Adjusted the inner pressure of airbags to low down the vessel&period; Generally the bottom vessel can be 0&period;5~0&period;8m above the ground&period;

3-2&period; All hte airbags should be centered the ship and upright to the launching direction&period;

3-3&period; Start the towing winch to release the ship slowly&period; When the first airbag rolls out of the tow&comma; move it to the stern and place it at the planned position&period;

3-4&period; Repeat the former process and move ship to the right position&period;

3-5&period; Clean the launching area&period; When the water depth is enough for launch people may cut off or release the ropes to launch the ship&period; If the launching water area is limited&comma; people may use towing winch to release ship slowly into the water&period;